Cam for internal-combustion engines.



F. WATERMAN.

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APPLICATION ILED AUG.I l9l6. 1280,912. Patented Ost. 8,1918.

FFIE.

FLOYDWATERMAN, OF NEW LISBON, WISCONSIN.

CA1VI FR INTERNAL-COMBUS'IION ENGINES.

Specification of Letters Patent.

Putented Oct. 8, 1918.

Application fi1ed August 1, 1916. Serial N0. 112,588.

T all wkom z't may concem:

Be it known thut I, FLOYD VATERMAX, u citizen 0f the United Stutes, rcsiding ut New Lisbon, in the county 01 Juneuu und. Stute 01 \Viscbnsin, hzwe inventcd ncw und useful Improvements in Cums f01' Intcrnul- Combustion Engines, of \vhich the tfo1lowing is u specificution.

This invention reluteS t0 cums cspeciully designcd 1'01 pperut-ing the vulvcs 0f internul. combustion engines 0f thc four cycl6 type, the object 0f the invention being t0 produce u (um which W111 render possible extra high engine spced, insure the opening und closing 0f cither thc intuke 01 exhuust W11Ve with which it is ussociuted und uccurutely time the pcriod during which tl1e vulve is su stuined in an opcn position us-wcll us the period in which rhe vu1ve is sustained in u closed osition.

A further objecb in "icw is so dispense with thc usuu1 expensive cum shuft und also obtuin greuter efliciency in the horse Power delivered by the engine by the employment 015 lighter vulve closing springs which ure rendercd possible by the cum o1 this invcntion, suid cum operuting in both directions 0n the tuppet 01 push 1od in contrudistinction 130 the present vu1ve operuting mechunism, wherein the vulve is opened positively but depends entirely upon the vulve seuting spring f01 its closing operation.

\Vith the ubove und other objects in view, the invention consists in the novel construction, combinution und urrungemcnt, herein fully described, illustruted und cluimed.

In the uccompunying druwing:

Figure 1 is u fuce view of u cum embodying the present invention showing ehe switch in one of it's tw0 positions.

Fig. 2 is u similur view showing the switch in its other osition.

Fig. 3 is u diumetricul section through the sume on the line 33 of Fig. l.

In the prcferred embodiment 01' this invention, the body 1 of the cum is of generu1ly cylindricul formution us shown in Figs. 1 und 2. In the working fuce 0f the body 1, the Iutter is formed with u cumwuy 01 guidewuy of' speciul configurution, suid cumwuy embodying u generully unnular vu1vc closing run 01' pmtion 2, u vu1ve opening run 01' nortion 3, un oblique connecting pussuge 4 between the runs 2 und 3, und unother oblique pussuge 5 connecting Sa'id runs 1 und 2.

6 designures u switch which is mounted 011 u pivot 7 und which oscillutes back und forth betwccn thc runs 2 und 8. The switch 6 is provided with an urm 8 huving u work ing fucc 9 uguinst which, in the prefelred embodiment of this invention truve]s u 101101 10 011 the vulve operuting connection 11 which muy consist either of the usuul tuppet 01 push rod 01 the vulve stern itsc1f.

In uddition to die arm 8, the switch 6 comprises u projection 12 und unother pro jection 13, the projection 12 being uduptcd t0 cxtend into the run 2 und the projection 13 being udupted t0 extend into thc run 3 us illustruted in Figs. 1 und 2. The switch 6 is hold ut eithcr limit of its movement by meuns of u spring 14 Which is of the bowed type, one end thereof being connected ut 15 to the switch und the other end thereof being connected ut 16 to u fixed point of the body 1. 'Ihe points of uttuchment 15 und 16 u1e so urrunged with respect t0 the pivot 7 of the switch 6 thut when the switch is in the position in Fig. 1, the point 15 lies on the innen side of i;he imuginury line druwn through the points 7 und 16. 1Vhen the switch is in its other position us shown in F ig. 3, the point 15 lies ut the outer side of an imuginury line druwn through the points 7 und 16. Therefore the spring 14 acts to hold tlie switch 6 in the position shown in either 01? suid figures.

The body 1 of the cum is mounted fast on u cum shuft 17 und is shown us connected thereto by meuns of u key 18.

In operution, sturting ut the point a the 1011e1 10 truve1s in the direction of the urrow ulong the dotted 1ine 0f Fig. 1until it comes in contuct With the projection 12 uguinst Which it ucts to shift the switch from the position shown in F ig. 1 to the position shown in Fig. 2. It laben continues ulong the dotted line b o:f Fig. 2 until it mukes ncurly u complete circ1e whereupon it truvels ulong the working fuce 9 of the arm 8 of the switch und mcets the projection 13, the resu1t being thut the switch is uguin shifted t0 the position shown in Fig. 1. The pussuge 5 cuuses the valve to be shifted to un 0pen position by cuusing the roller 10 to move from thc 1'11n 2 into the run 3. The pussage 4 cuuses the roller to move from the mm 3 buck into the run 2 thereby closing the valve. During the tw0 rev1olutio1is 0f th crzmk shaft und the czun shaft, the roller 10 occupies the 1u11 2 f01 approximately 0ne and one-half revolutions 01 the crank shaft and said roller occupies the 1'111). 3 f0r approximately one-half 0f 'the revolutions of the crank shaft. Thus the valve is opened and sustained in an open positiononce in each two complete revolutions of the crank shaft which is necessary to the proper operation of a four cycle internal combustion engine.

'Ihe body 1 is formed With a recess 19 t0 recei've the ftee extremity 0f the arm 8 when the latter moves outwardly und the body is alse cut away to form a recess 20 for the projection 12 when the switch 6 is in the position shown in Fig. 2.

It Will be understood that the (mm operates With a pulling ns wel1 zus a pushing operation 0n the push rod and therefore a hghter 01 weaker sprlng-may be used for c1os1ng the vah"e zmd holdmg the Same againsu its seat. In a multiple cylinder env gine embodying an inlet and exhaust valve f01 each cylinder, a considerable a mount of load is thus taken from the czun shaft 17 mental ortion extending not 110 exceed one hundred and eighty degrla'es, a sWitch pi'votal1y mounted in one of said connecti1'1g passages and hm ing a projection adapted 130 extend into the annular portion 0f the 1un and alsohaving a projection adapted t0 extend int0 the segmentzml portion of -the um, and means f0r yieldingly sustainihgsaicI switch in either osition t0 direct a valve actuating member alternately into the 2m- 111112u run and the segmental run, whereby the engine valve is opened only once in two revolutions 01 the engine shaft.

In testimony Where;of I affix m-y signature.

FLOYD VVATERMAN.

- Copies of this patent may be obcained. for five cents each, by addressing the C0mm-issioner of Patents,

Washington, D. G. 

